Wolfson WM8978, Manual, Page: 106 / 119

WM8978
Production Data
w
PD, Rev 4.5, October 2011
106
REGISTER
ADDRESS
BIT LABEL DEFAULT DESCRIPTION REFER TO
5:0 LOUT1VOL 111001 Left headphone output volume:
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB Analogue
Outputs
53 (35h) 8 HPVU N/A LOUT1 and ROUT1 volumes do not update until
a 1 is written to HPVU (in reg 52 or 53) Analogue
Outputs
7 ROUT1ZC 0 Headphone volume zero cross enable:
1 = Change gain on zero cross only
0 = Change gain immediately Analogue
Outputs
6 ROUT1MUTE 0 Right headphone output mute:
0 = Normal operation
1 = Mute Analogue
Outputs
5:0 ROUT1VOL 111001 Right headphone output volume:
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB Analogue
Outputs
54 (36h) 8 SPKVU N/A LOUT2 and ROUT2 volumes do not update until
a 1 is written to SPKVU (in reg 54 or 55) Analogue
Outputs
7 LOUT2ZC 0 Speaker volume zero cross enable:
1 = Change gain on zero cross only
0 = Change gain immediately Analogue
Outputs
6 LOUT2MUTE 0 Left speaker output mute:
0 = Normal operation
1 = Mute Analogue
Outputs
5:0 LOUT2VOL 111001 Left speaker output volume:
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB Analogue
Outputs
55 (37h) 8 SPKVU N/A LOUT2 and ROUT2 volumes do not update until
a 1 is written to SPKVU (in reg 54 or 55) Analogue
Outputs
7 ROUT2ZC 0 Speaker volume zero cross enable:
1 = Change gain on zero cross only
0 = Change gain immediately Analogue
Outputs
6 ROUT2MUTE 0 Right speaker output mute:
0 = Normal operation
1 = Mute Analogue
Outputs
5:0 ROUT2VOL 111001 Right speaker output volume:
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB Analogue
Outputs
56 (38h) 8:7 00 Reserved
6 OUT3MUTE 0 0 = Output stage outputs OUT3 mixer
1 = Output stage muted – drives out VMID. Can
be used as VMID buffer in this mode. Analogue
Outputs
5:4 00 Reserved